Reference and provenance data
In some instances it is helpful to record provenance2 metadata as reference to improve an understanding and context of a claim.
For example, the statement "Berlin has a population of 3 500 000" is untested in context of a missing reference or axiomatic declaration, yet in spite of lacking evidence the claim is expected to be "true"3 under the open-world assumption.
Some users (see SMW issue 4 and in some situations, relying on untested claims maybe challenging therefore Semantic MediaWiki 2.5.0Released on 14 March 2017 and compatible with MW 1.23.0 - 1.29.x. introduced the new datatype "Reference"Holds a value that associates it to individual defined provenance metadata record5 with which an untested claim can be transformed into a factual claim by recording provenance metadata678 (as to when, how, by whom a claim was made) and hereby allows to state tangible or convergent evidence1.).
For an exhaustive description on how to use the data type for provenance recording, please see the (see SMW issue 6 as well as the Semantic MediaWiki Sandbox example page on the corresponding pull request #1812.9).
Semantic Cite extension vs. Reference datatype
In extension "Semantic Cite"Provides a simple way of organizing citation resources with the help of semantic annotations. where a statement is known as citation resource, a reference represents a "loose" attachment to any text or link without correlation to a specific claim or annotation. On the other hand a typed reference (and hereby its provenance data) is individually linked to its statement and inherently bound to a specific value assignment and only exists in context of that statement and ceases to exist when the statement is removed.
- Page on Semantic MediaWiki issue #1808
- Video on how to use the reference type to record some provenance metadata
- Example on Semantic MediaWiki Sandbox for pull request #1812
- Help page on datatype "Reference"Holds a value that associates it to individual defined provenance metadata record
- Help page on special property "Has fields"Defines a short list of fields with a fixed type and order for datatype Record